Jig-saw



Oct. 13, 1931.l R. H. BEEBE 1,325,983'

JIG SAW Filed July l2, 1930 INVENTOR v5 to thework.

Patented Oct. 13, 1931A UNITED PATENT vo1-*F1cnfvl u Bonner nemen, or SEATTLE. WASHINGTON Q fugue-saw f yapplisnon`n1edrn1y 1a, 1930. seriai My invention relates tojig-savvatlie object, generally stated, being the pIQVSlOu 0f a most simplified device 0f thiShaI'iwtel' 99,-?

erable to effect a `most vadvantageoi'is action l Such objective, kmore particularly,lies-in the provision of a Jig-saw vvherel. novel tension devices are arranged in a most effective marmer capable of eliminating guidemem-- bers such as sawsupporting. crossfbeads and Work-retaining gauge plates, f l

Such object further liesfin the noveldispo-r sition of such saw tension members in a man` ner effectively eliminating work dislodgment customarily resultant of theupstroke activityof saws of this character., and. in further'affording a progressive cut to the Work in the downl stroke activity of ythe saw. `T

Further objects and advantages,with respect to crank construction, convertibility and general assembly, together with the fore-fA going, will become apparent: in the .course of the following description land elaimathe invention consisting in the novel construe tion. the adaptation and combination of parte hereinafter describedand claimed. In the drawings,e

Figure 1 is a side elevation vof apparatus embodying vthe present invention, parts lJeing broken away and shown in vertical longitudinal section. Fig. V2 is a topplan View f the same; and Fig. 3 is an enlarged elevate tional detail illustrating preferred construe tion of a motive source. parfsbeing broken away and shown in section f Reference being had thereto, the numeral 5 indicates a source of energy, such asan electric motor, utilized inthepresent inventionV as a base member for supporting, through the medium of upwardly converging legs '6, the horizontal arm 7 of a channelponformed Standard 8. A' i Saidk standard, moreover, is conliguredto present, Vcontiguolrs with ysaid arm, `:nioffset 9 therebelovv, an'upturned hooklO,

terminal 11, .sa-id terminaland'oset beingV disposedl in spaced parallel Ipla-nes angularly `arrangerl tothe horizontal, and retrognesslvely from the vstandard ,armff inv a manner;

More particularly,

idly arranged Vabove the l lodgment,

Np. .4117,519,V I

to support respective major and minor pari` allel spring leafl members 12,13.

`Op eratively secured to saidrsprmg 13, as

a staple memberf'll, I provide a connecting rod 15 preferably conformed of Wire for encasing engagement about` the vgrooved Wheell of a ball bearing assemblS generally represented as 17 .f Y

Hub'18 ofsaid assetrically ofthe Iaxis of a pulley 19 as by a cap screw; 20, set screW21 securing the pulley hub tothe arbor 22 of theaforesaid-motor.

assembly is arranged, relative to arbor 2 2 to provide a spring lWorking stroke from the aforesaid angularity to a disposition substantially horizontal as representedfby dotted line-s 121, 131, of Fig. 1. v

Terminals of said springs are conformed inv oppositionalhooks 23, 24, slotted .as` at for the interposition Lof .a conventional saw blade 2 6, pins .27 of which are arranged for kbear-ing engagement to outer lface portions of the hooks. Y

gflntegrally Y secured las" `by countersunk Leaf spring a greater rigidity thanztlie guide spring 13 in retaining blade tension responsive to the retractile npstroke ativity.

j Itis to belnoted speed of operation, heretofore impossible in jig saws, is yattained through novel .structural features. YIn this particular, the-ball' bearing assembly .17 .educes frctioilel tndeILCi-QS, relative rieidityef serine member 12 01300961'- vvith that an excessively bly is secured eccenthe axisA of said bearing ating in the provision of a most effective tensional force. Ready replacement ot the wearing parts, namely blade 26, staple 14 and connecting rod 15 is afforded. Cap screw 20 may be removed in utilizing pulley 19 for such other work as might be desired.

While I have illustrated and herein described my invention in a preferred manner best seen to attain novel objectives contemplated, t is not my intention to confine iny-l selt1 thereto except as byy the scope of the hereto annexed claims.

1. A jig-saw comprising a rigid motor, a standard mounted on the traine of said motor and having a horizontal arm extending over said motor, said standard being conformed to provide an oilset portion below and a terminal port-ion above the plane of said arm, said offset and terminal being arranged parallel, one with the other, and at an inclination to the horizontal, said offset and terminal portions having leaf springs secured thereto for disposing the same in normal up wardly inclined dispositions hooks provided in end extremities oi said springs, a work supporting table mounted on said horizontal arm, said table having an aperture therein disposed in the vertical planeet said hooks, a radial slot communicatively disposed to said aperture, means for detachably engaging a saw blade inserted through said slot over said hooks, and means cooperative with spring retraction for reciprocating said saw blade to provide a Working stroke from the aforesaid normal spring angularity to a horizontal disposition of the springs, said last named means comprising a pulley rigid with the arbor of the motor, a crank arm eccentrically disposed on said pulley, anda connecting rod interconnecting said crank arm to the lowermost spring.

2. In apparatus as described in claim 1, wherein said crank arm constitutes a detachable ball bearing assembly.

3. A saw comprising a base, a standard mounted on said base, said standard providing a horizontal arm, and an offset portion below and a terminal portion above the plane of said arm, said oiise" and terminal portions being disposed at inclinations from the horizontal and substantially parallel, one with the other, a. work supporting table mounted on said horizontal arm, leaf springs secured to said terminal and oiifset portions to dispose the same in normally inclined planes above and below said table. an aperture in said table arranged in vertically aligned disposition to the extremities of said springs, means to insert a saw blade through said aperturc into detachable engagement to said spring extremities, a crank, operative connection between said crank and one Aof said springs, and means to rotate said crank for imparting reciprocation tothe saw blade in a stroke activity from the aforesaid normal spring angularity to a substantial horizontal disposition of the same.

4. A jig saw comprising a base, rigid work supporting table above said base, leaf springs, means to support said springs in parallel normally inclined dispositions above and below said table, an aperture in said table arranged in vertical alignment to extremities of said springs, means to insert a saw blade to said aperture for detachable engagement to spring extremities, a crank, operative connection between said crank and one ot' saidl springs, and means to rotate said crank for imparting reciprocation to the saw blade in a stroke activity from the aforesaid normal spring angularity to a substantial horizontal disposition of the same.

5. A jig saw comprising a base, a rigid work supporting table above said base, leal springs, means to support said springs in parallel normally inclined dispositions above and below said table, an aperture in said table arranged in vertical alignment to extremities of said springs, means to insert a saw blade to said aperture for detachable engagement to said spring extremities, and means cooperating with said springs forimparting reciprocation to the saw blade in a stroke activity from the aforesaid normal spring angularity to a substantial horizontal disposition of the same.

6. A jig-saw having a sawblade secured to extremities of angularly disposed parallel leaf springs, and means cooperative with the retractile energy of said springs for imparting reciprocatory activity to the blade, the angularity of vsaid springs being arranged such, relative to the plane'of work progression, as tofeed said blade to the work in the down-stroke activity thereof, and to recede from said work in the upstroke activity thereof.

'7. A jig-saw having a saw-blade suspended between a spring tension. member and a mov able guide, and means cooperative with the retractile energy afforded by said tension member for imparting reciprocation to the blade, said tension member being arranged such as to progressively feed and recede the blade to and from the work in respective down and up strokes of reciprocation.

8. A jig-saw having a saw blade, a crank, a hub member adapted for detachable securement to said crank. a ring member freely mounted for revoluble activity about said hub, and a connecting rod secured to said ring member and having operative connection with said blade forirnparting reciprocatory activity to the latter responsive to revoluble activity ofthe crank arm.

9. ln apparatus as described in claim 8, wherein said hub securement comprises a bolt interengaging said hub and the crank.

10. In apparatus as described in claim 8,

. wherein said revoluble mounting for the ring member constitutes a ball race interposed therebetween and the hub. Y I j v Y 11. A jig-saw comprising a rigidwork supporting table havinga frame therefor pro-` jecting rearwardly of said tableJ and turned upwardlyrto afford a work-receiving throat and a return terminal above the plane of said table, a leaf-spring having one end rigidly attached to said terminal to have its free eiid project over the table, a second leaf-spring having one end rigidly attached to said frame to have its free end project under said table, a saw blade suspended between the free ends of said springs, said springs being parallel one with the other and said upper spring'bcing characterized by a rigidity relatively in excess of said lower spring to retain tension on said blade in maintaining the same in at# tached relation with respect to the spring ends, and means co-operative with the retractile energy of said springs for imparting reciprocatory activity to the' blade.

1Q. A jig saw having a saw blade suspended between a" pair of vertically-spaced vibratory arms, and a connecting rod having operativeconnection with one of said armsV and serving to reciprocate said blade, said reciprocatory activity disposingv the arms at inclinations to the horizontal in the extreme up-stroke cycle of reciprocation ofsaid blade and in approximate horizontal dispositions are constantly maintained parallel, one to another.- v

16. Iny a vjig-saw 1 having a saw-blade supported to feed the blade directively to and from thel work in respective down and upv strokes i of reciprocation, spring tension means lserving to normally maintain said saw-blade in its uppermost disposition, and

means co-operative with the retractile energy afforded by said. spring tension ineansfor imparting said reciprocatory activity to the blade. j y

Signed at Seattle, Washington, day of June, 1980.

ROBERT BEEBE.

this 25th in the eXtreme'down-stroke cycle of reciprocation of said blade. f.

13. In a jigsaw, a saw-blade, a pair of parallel vertically-spaced vibratory arms, means to suspend the blade between free ends of said arms, and a connecting rod having oper of said arms and blade said recipative connection with one serving to reciprocate said rocatory activity out the down stroke cycle of reciprocation outwardly from a plane taken through the point of vibratory suspension lof said, arms, and directively toward said suspension plane throughout the upstroke cycle of reciprocation. f

14. A jig-saw having a sawblade supported to maintain the same perpendicularly feeding the blade through-v throughout reciprocatory activity of the v saine, and a connecting rod having operative connection with said blade to afford a movement of the perpendicular plane thereof directively toward the work throughout lthe down-stroke cyclefof reciprocation and directively from the work throughout the upstroke cycle of reciprocation. j v

15. A jig-saw having a saw blade supported in an upright disposition and reciprocated by a connecting rod havingv operative connection therewitlnthe planelof said blade feeding and receding horizontallyKV to and from the work throughout the respective down and up stroke cycles of reciprocation,

and wherein said horizontally moving planes izo 

